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研究领域是超导量子计算和超导器件

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姓名：于扬
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博士生导师
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凝聚态物理学
研究兴趣：研究领域是超导量子计算和超导器件

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2010-11-09

【期刊论文】Tunable quantum beam splitters for coherentmanipulation of a solid-state tripartite qubit system

于扬， Guozhu Sun ，， Xueda Wen， Bo Mao， Jian Chen， Yang Yu， Peiheng Wu， & Siyuan Han

，-0001，（）：

-1年11月30日

摘要

Coherent control of quantum states is at the heart of implementing solid-state quantumprocessors and testing quantum mechanics at the macroscopic level. Despite signifi cantprogress made in recent years in controlling single-and bi-partite quantum systems, coherentcontrol of quantum wave function in multipartite systems involving artifi cial solid-state qubitshas been hampered due to the relatively short decoherence time and lack of precise controlmethods. Here we report the creation and coherent manipulation of quantum states in a tripartitequantum system, which is formed by a superconducting qubit coupled to two microscopictwo-level systems (TLSs). The avoided crossings in the system's energy-level spectrum due tothe qubit-TLS interaction act as tunable quantum beam splitters of wave functions. Our resultshows that the Landau-Zener-St ü ckelberg interference has great potential in precise control ofthe quantum states in the tripartite system.

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2010-11-09

【期刊论文】Quantum Jumps between Macroscopic Quantum States of a Superconducting Qubit Coupledto a Microscopic Two-Level System

于扬， Yang Yu，， * Shi-Liang Zhu， + Guozhu Sun， ? Xueda Wen， Ning Dong， Jian Chen， Peiheng Wu， and Siyuan Han

，-0001，（）：

-1年11月30日

摘要

We report the observation of quantum jumps between macroscopic quantum states in a superconductingphase qubit coupled to the two-level systems in the Josephson tunnel junction, and all key features ofquantum jumps are confirmed in the experiments. Moreover, quantum jumps can be used to calibrate suchtwo-level systems, which are believed to be one of the main decoherence sources in Josephson devices